# Principles

- [Contacts, Chatrooms & Customer Lifecycles](/principles/contacts-chatrooms-and-customer-lifecycles.md): This page describes Contact, Chatroom and their lifecycle as well as how to handle multiple Contacts with the same Phone Number
- [Multiple WABA & Phone Numbers](/principles/multiple-waba-and-phone-numbers.md): Multiple WABA accounts and Multiple Phone Numbers in each WABA account.
- [Sending messages via automation](/principles/sending-messages-via-automation.md): This section deals with automation in chats to send messages and run workflows.
- [Attributes & Attribute Matcher](/principles/attributes-and-attribute-matcher.md)
- [Apps on Saleschat](/principles/apps-on-saleschat.md)